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Add 18/21 and 90/24

1st number: 18/21, 2nd number: 3 18/24

18/21 + 90/24 is 129/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 24 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 21 × 8 = 168,
    18/21 = 18 × 8/21 × 8 = 144/168
  3. Likewise, for the 2nd fraction, since 24 × 7 = 168,
    90/24 = 90 × 7/24 × 7 = 630/168
  4. Add the two like fractions:
    144/168 + 630/168 = 144 + 630/168 = 774/168
  5. 774/168 simplified gives 129/28
  6. So, 18/21 + 90/24 = 129/28
    In mixed form: 417/28

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